V4L/DVB (7610): em28xx: Select reg wait time based on chip ID

This is more conservative than just removing the msleep() from
em28xx_write_regs_req(), since some old hardware may still need it.
So, it will remove the sleep time only for those chips where this
removal were tested.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index 7dfea3ac9b2f..0c71e599c140 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -525,6 +525,20 @@ static void em28xx_set_model(struct em28xx *dev)
  */
 void em28xx_pre_card_setup(struct em28xx *dev)
 {
+        int rc;
+
+        dev->wait_after_write = 5;
+        rc = em28xx_read_reg(dev, CHIPID_REG);
+        if (rc > 0) {
+                switch (rc) {
+                case 36:
+                        em28xx_info("chip ID is em2882/em2883\n");
+                        dev->wait_after_write = 0;
+                        break;
+                default:
+                        em28xx_info("em28xx chip ID = %d\n", rc);
+                }
+        }
         em28xx_set_model(dev);
 
         /* request some modules */